Effects of organic carbon quality on the sorption behavior of pesticides in Japanese soils

Motoki, Yutaka; Iwafune, Takashi; Seike, Nobuyasu; Otani, Takashi; Asano, Masaharu

doi:10.1584/jpestics.d13-067

Cited by 26 publications

(25 citation statements)

References 43 publications

(71 reference statements)

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“…The aliquots of water extracts and concentrates of acetone extracts from soils were also analyzed using two different methods, 11) whereas group B was analyzed using the method applied for the analysis of Komatsuna shoots (Supplemental Fig. S2).…”

Section: Pesticide Analysismentioning

confidence: 99%

Relationship between plant uptake of pesticides and water-extractable residue in Japanese soils

Motoki

Iwafune²,

Seike

et al. 2015

J. Pestic. Sci.

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The relationship between pesticide concentrations in Komatsuna (Brassica rapa var. perviridis) shoots and the extractable concentrations in soils by a sequential soil-extraction method was investigated in 8 pesticides and in 4 soils. Concentrations of many pesticides in Komatsuna shoots showed higher positive correlation with water-extractable than with total-extractable soil concentrations. We also examined the effects of the soil-aging periods (SAPs) between pesticide applications and sowing on pesticide concentrations in Komatsuna shoots. Pesticide concentrations in Komatsuna shoots and soil-water extracts decreased with increasing SAPs. These results imply that estimating the pesticide concentrations in crops based on water-extractable concentrations in soil and setting the appropriate SAPs prevent contamination of crops by pesticide residues in soil. However, the correlation between pesticide concentrations in Komatsuna shoots and water extracts in soils, and the effectiveness of pesticide reduction in Komatsuna shoots by setting long SAPs differed according to the pesticide type. Hence, the applicability of the water-extraction method should be verified for each pesticide.

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Section: Pesticide Analysismentioning

confidence: 99%

Relationship between plant uptake of pesticides and water-extractable residue in Japanese soils

Motoki

Iwafune²,

Seike

et al. 2015

J. Pestic. Sci.

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“…These results support the assumption that volcanic ash soils have a higher adsorption capacity (higher K OC value) than do alluvial soils, due to a higher content of organic carbon (% OC ), which might be an important factor in characterizing the pesticide detection pattern. However, a recent study 35) reported that the adsorption characteristics of volcanic ash soils affected not only the % OC but also the quality of organic carbon, so it was difficult to determine the factor affecting the difference between soil types within this study.…”

Section: Effect Of Experimental Design and Soil Typementioning

confidence: 96%

Performance evaluation of lysimeter experiments for simulating pesticide dissipation in paddy fields. Part 1: Submerged application of granular pesticides

et al. 2019

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Three-year comprehensive experiments were conducted to compare the dissipation patterns of a total of 16 pesticides, including 3 metabolites, as granular formulations applied in lysimeters and paddy fields with two soil types. Analytical concentrations of the target pesticides in paddy water were analyzed using a granular kinetic model consisting of the following parameters: release rate, decrease rate, and dissolved concentration. Results of parameter grouping analyses of the kinetic models showed that 56% of data reproducibility (entire grouping) was obtained between replicates for the lysimeters. In comparisons between the lysimeters and paddy fields, 48% of decrease rates and 34% of release rates were grouped, although significant differences were observed with a nearly 90% difference for dissolved concentrations. These differences might be attributed to the hydrological components such as water management and meteorological covariates in paddy fields, the daily percolation in lysimeters and the adsorption-desorption kinetics between paddy water and soil.

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“…The aliquots (15 mL) of water extracts and concentrates (<15 mL) of acetone extracts from soils were analyzed using three different methods for each analytical group, as previously described in detail. 21) The aliquots and concentrates were cleaned with a diatomite column (InertSep K-solute 20 mL; GL Sciences, Tokyo, Japan), and the following solid phase extraction cartridges were used: a PSA column (500 mg; Supelco, Bellefonte, PA, USA), an Accell CM column (500 mg; Waters, Milford, MA, USA) and an ENVI-Carb II/PSA column (500 mg/500 mg; Supelco) for analytical groups A, B and C, respectively. The cleaned samples were analyzed by liquid chromatographytandem mass spectrometry for group A (Supplemental Tables S1 and S2) and gas chromatography-mass spectrometry for groups B and C (Supplemental Tables S3 and S4).…”

Section: Laboratory Experimentsmentioning

confidence: 99%

“…The details of analytical methods are described in our previous report. 21) where C is the calculated value, O is the observed value, Ō is the mean of all observed values and χ 2 m,α is the tabulated chi-square value where m is the degrees of freedom-the number of measurements minus the number of model parameters-and α is the probability (5%).…”

Section: Laboratory Experimentsmentioning

confidence: 99%

Effects of temperature on the dissipation of total- and water-extractable pesticides in Japanese soils

Motoki¹,

Iwafune²,

Seike

et al. 2020

J. Pestic. Sci.

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We investigated the dissipation of 27 pesticides in five Japanese soils at three temperatures and the variability of activation energies (E a). The dissipation of total pesticides extracted sequentially using water and acetone was fitted to a single first-order (SFO) model. The E a values calculated from the dissipation rate constants of the SFO model showed a normal distribution with a median of 61.1 kJ mol −1. The dissipation of water-extractable pesticides (i.e., phytoavailable pesticides) was fitted to a double firstorder in parallel model with two dissipation rate constants: k 1 and k 2. The E a values calculated from k 1 and k 2 showed normal or lognormal distribution, and the medians of the normal distribution calculated from k 1 and k 2 were 62.8 and 45.2 kJ mol −1 , respectively. Furthermore, the method for estimating the biphasic dissipation of phytoavailable pesticides at different temperatures by using the median E a values of the laboratory experiment was demonstrated in a field experiment.

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Effects of organic carbon quality on the sorption behavior of pesticides in Japanese soils

Cited by 26 publications

References 43 publications

Relationship between plant uptake of pesticides and water-extractable residue in Japanese soils

Relationship between plant uptake of pesticides and water-extractable residue in Japanese soils

Performance evaluation of lysimeter experiments for simulating pesticide dissipation in paddy fields. Part 1: Submerged application of granular pesticides

Effects of temperature on the dissipation of total- and water-extractable pesticides in Japanese soils

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